Ballpen



FIG. 1 is a perspective view of the ballpen, showing my new design;

FIG. 2 is an enlarged bottom plan view thereof;

FIG. 3 is an enlarged top plan view thereof;

FIG. 4 is a right-side elevational view thereof;

FIG. 5 is a left-side elevational view thereof;

FIG. 6 is a front elevational view thereof;

FIG. 7 is a rear elevational view thereof; and,

FIG. 8 is an enlarged perspective cross-sectional view thereof taken along line 8—8 in FIG. 4.

The two circles shown in broken lines in FIG. 8 are environmental matter and form no part of the claimed design. 

The ornamental design for a ballpen, as shown and described. 